// # 背景图像重复
// 用于控制元素背景图像重复的功能类。
.bg-repeat
  background-repeat repeat

.bg-no-repeat
  background-repeat no-repeat

.bg-repeat-x
  background-repeat repeat-x

.bg-repeat-y
  background-repeat repeat-y

.bg-repeat-round
  background-repeat round

.bg-repeat-space
  background-repeat space
